enc_path = content_root_cmd + '/cmd/' + cmd_filename
out_path = join(content_root, 'cmd', cmd_filename)
print(f'Generating {enc_path}')
highest_index = 0
content_ids = {}
for record in cia.content_info:
highest_index = record.cindex
with cia.open_raw_section(record.cindex) as s:
s.seek(0x100)
cmac_data = s.read(0x100)
id_bytes = bytes.fromhex(record.id)[::-1]
cmac_data += record.cindex.to_bytes(4, 'little') + id_bytes
c = crypto.create_cmac_object(Keyslot.CMACSDNAND)
c.update(sha256(cmac_data).digest())
content_ids[record.cindex] = (id_bytes, c.digest())
# add content IDs up to the last one
ids_by_index = [CMD_MISSING] * (highest_index + 1)
installed_ids = []
cmacs = []
for x in range(len(ids_by_index)):
try:
info = content_ids[x]
except KeyError:
cmacs.append(bytes.fromhex('4D495353494E4720434F4E54454E5421'))
else:
ids_by_index[x] = info[0]
cmacs.append(info[1])
highest_index = 0
content_ids = {}
for chunk in tmd.chunk_records:
try:
with open(os.path.join(content_dir, chunk.id + '.app'), 'rb') as f:
highest_index = chunk.cindex
f.seek(0x100)
header = f.read(0x100)
id_bytes = bytes.fromhex(chunk.id)[::-1]
data = header + chunk.cindex.to_bytes(4, 'little') + id_bytes
data_hash = sha256(data)
c = crypto.create_cmac_object(keyslot)
c.update(data_hash.digest())
content_ids[chunk.cindex] = (id_bytes, c.digest())
except FileNotFoundError:
# currently unknown if there's actually a process to generating the cmac for missing contents
pass
# add content IDs up to the last one
ids_by_index = [MISSING] * (highest_index + 1)
installed_ids = []
cmacs = []
for x in range(len(ids_by_index)):
try:
info = content_ids[x]
except KeyError:
# the 3DS actually puts either random data, or generates it using an unknown process.